Emerson Rosemount Xstream Series - Fig. 6-3: LOW and LOW-LOW Alarm Mode

X-STREAM
Emerson Process Management GmbH & Co. OHG 6-17
Instruction Manual
HASAxE-IM-HS
05/2006
6 Initial Startup
• Setting "LOW" and "LOW-LOW" alarms
Standard mode:
If an alarm is activated, the corresponding
alarm outputs a "High" level signal.
Settings:
• Level 1 > level 2
• Level 1 function: Low
• Level 2 function: Low
Fail-safe mode:
If an alarm is activated, the corresponding
alarm outputs a "Low" level signal.
Settings:
• Level 1 > level 2
• Level 1 function: Low FS
• Level 2 function: Low FS
As long as any alarm is activated a status
message appears in the measuring screen's
4
th
line.
Fig. 6-3: LOW and LOW-LOW alarm mode
6-2 Checking the Instrument's Setup
Setting the one threshold below the allowed
level and the second threshold below the first
threshold (fig. 6-3) results in an operation mode
which gives a prealarm ("LOW alarm") when
the current concentration falls below the "low"
threshold level (area "B"). Also, a main alarm
("LOW-LOW alarm") is activated if no correc-
tive action was performed and the current
concentration falls below the "low-low" threshold
level (area "C").
Up to two alarms can be activated at a time for
each channel!